oh well

 

@MisterBill2 I believe he said he was not going to go the route of tube filaments. Said in his haste he may have broken a few things like sockets. Possibly ripped out wiring as well. Said he wants to go with the LED's.

@mike_drop The fish tank idea was one I entertained way back in the 70's. But never attempted it. Had a friend who PUT a tank in a console and it looked pretty cool.

What I want to do (some day) with an old CRT is to disconnect the horizontal and vertical inputs and make my own inputs so that I can chase a single dot around in a circle. (with a color TV, three dots). Why? I want to pulse the beam with an audio signal while the dot circles the screen fast enough to appear as if it's a continuous circle. The audio signal will interrupt the beam causing a dot pattern to emerge. Depending on the frequency of the audio signal those dots may appear to rotate left or right. The dots may appear as longer dashes with the lower frequencies, and with multiple signals going at once dots and dashes may appear and travel in different directions as the audio source frequencies change (music). Been sort of working on a laser dot projector and a rotating mirror to create a circle on the wall, but the results have been less than spectacular so far.

Lots of interesting things to be done with LED's. Personally I think (in your project) I'd have opted for the blue, if not near ultra violet color. But it's your project. Let us know how we can help. As for how to power your LED's, like I said in post #3 about a power supply and all the LED's in parallel would be the best. The only question that remains is how to position the LED's. After all, it's not the LED's you want to be viewable it's the tubes you want to have that distinct glow.

 

Choosing the white is good, because white tends to be much brighter than the other colors.

 

@MisterBill2 I believe he said he was not going to go the route of tube filaments. Said in his haste he may have broken a few things like sockets. Possibly ripped out wiring as well. Said he wants to go with the LED's.

@mike_drop The fish tank idea was one I entertained way back in the 70's. But never attempted it. Had a friend who PUT a tank in a console and it looked pretty cool.

What I want to do (some day) with an old CRT is to disconnect the horizontal and vertical inputs and make my own inputs so that I can chase a single dot around in a circle. (with a color TV, three dots). Why? I want to pulse the beam with an audio signal while the dot circles the screen fast enough to appear as if it's a continuous circle. The audio signal will interrupt the beam causing a dot pattern to emerge. Depending on the frequency of the audio signal those dots may appear to rotate left or right. The dots may appear as longer dashes with the lower frequencies, and with multiple signals going at once dots and dashes may appear and travel in different directions as the audio source frequencies change (music). Been sort of working on a laser dot projector and a rotating mirror to create a circle on the wall, but the results have been less than spectacular so far.

Lots of interesting things to be done with LED's. Personally I think (in your project) I'd have opted for the blue, if not near ultra violet color. But it's your project. Let us know how we can help. As for how to power your LED's, like I said in post #3 about a power supply and all the LED's in parallel would be the best. The only question that remains is how to position the LED's. After all, it's not the LED's you want to be viewable it's the tubes you want to have that distinct glow.

I have built an oscilloscope out of an older tv set that used a separate oscillator and rectifier tube to supply the high voltage for the second anode. It did work fairly well, but then that was a much older round tube, a 10BP4, and so the beam deflection was easier. Doing the circle will be an interesting experiment, your serious challenge will be getting the high voltages and also switching the beam off and back on.